bear down vs shart

bear down

verb
  • To exert downward pressure on one's abdomen, as in giving birth, forcing out feces, and some similar bodily maneuvers. 

  • To approach in a determined manner. 

  • To steer away from the wind; to approach from windward. 

  • To intensify one's efforts. 

  • To push (someone) to the ground; to defeat, overcome. 

  • Used other than figuratively or idiomatically: see bear, down. 

shart

verb
  • To unintentionally defecate due to relaxing the anus to flatulate. 

noun
  • An instance of sharting. 

  • The resulting excrement from sharting. 

How often have the words bear down and shart occurred in a corpus of books? (source: Google Ngram Viewer )